The Battle of Marathon was fought between the Greeks and the Persians under Darius in 490 B.C.
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Marathon Map
In 490 B.C., a large force of Persians under Darius landed on the Plain of Marathon. The Spartans were unwilling to provide help for the Athenians in time, so with the help of 1,000 Plataeans, and led by Callimachus (polemarch) and Miltiades (former tyrant in the Chersonesus), Athens' army of about one third the size of the Persian's, fought the Persians and won by encircling the Persian forces.